If BJ can move up from LW to WW and get 2 immediate title shots why wouldn't GSP?
I'd say GSP deserves an immediate title shot IF he moves up to MW.
I personally don't think GSP will move up to MW. He really doesn't seem too motivated to do it and says it would be a big transformation since he would have to put on muscle and the move would be permanent. Even if he puts on weight he would still be a smaller MW and would likely not be able to be as dominant of a wrestler hence he would not do as good in the weight class.
Guys like Franklin, Belcher, Okami and Silva are all HUGE MW's who cut a lot of weight to get to 185.
GSP's home is WW.